arXiv Open Access Articles, an open-access e-print service for the sciences, offers more than 100,000 articles in physics. Owned by Cornell University, arXiv is partially funded by the National Science Foundation.
Directory of Open Access Journals, or DOAJ, is a fast-growing collection of "free, full-text, quality-controlled scientific and scholarly journals" in a broad range of subjects and languages. See the Institute of Physics' New Journal of Physics which has one of the highest impact factors in physics.
Lawrence Berkeley National Laboratory: Physics Division is a U.S. Department of Energy National Laboratory Operated by the University of California.
Discoveries and innovations in physics that began with support from The National Science Foundation (NSF).
IOP News covers the latest news from both the Institute of Physics and the national and international physics.
American Academy of Health Physics, a nonprofit organization, works in the science of radiation protection, is the profession devoted to protecting people and their environment from potential radiation hazards, while making it possible to enjoy the beneficial uses of radiation.
American Association of Physics Teachers (AAPT) Founded in 1930, AAPT serves as a professional society of teachers of physics in colleges, universities, and secondary schools; undergraduates and graduates with major interest in physics.
American Board of Health Physics (ABHP) promotes the health physics profession by establishing standards and procedures for certification and conducting certification examinations.
American Center for Physics (ACP) is the center for many programs of physics societies
American Institute of Physics (AIP), a 501(c)(3) not-for-profit membership corporation, was created to advance knowledge of physics and its application to human welfare.
American Physical Society, founded in 1899 and a nonprofit membership organization working to advance the knowledge of physics, publishes 16 journals about physics.